Process of and apparatus for straightening carriage corner-irons



" (No Model.)

I E. 0. PORTER. PROCESS OF AND APPARATUS FOR STRAIGHTENING CARRIAGE CORNER moms. 110,446,950. ented Feb. 24,1891.

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UNITED STATES PATENT OFFICE.

EDVARD C. PORTER, OF NEW" HAVEN, CONNECTICUT.

PROCESS OF AND APPARATUS FOR STRAIGHTENING CAR RlAGE CORNER-IRONS.

SPECIFICATION forming part of Letters Patent No. 446,950, dated February 24, 1891.

Application filed February 20, 1890. Serial No. 341,189. (No model.)

To all whomI it may concern.-

Be it known that I, EDWARD C. PORTER, of New Haven,in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Appliances for and Method of Straightening Carriage Corner-Irons, which will, in connection with the accompanying drawings, be hereinafter fully described, and specifically defined in the appended claims.

In said drawings, Figure 1 is a side elevation of the top die (and holder) that when raised in a suitable frame is released and falling strikes the corner-iron to straighten and true the same. Fig. 2 is an inverted or under side'plan view of the parts shown in Fig. 1. Fig. 3 is a top plan view of the corner-iron-clamping device, with the corneriron held therein and shown as having been struck by the striking-die. Fig. 4 is a central sectional view of the corner-iron shown as having been acted upon by the strikingdie. I

This invention is an improvement upon that shown, described, and claimed in Letters Patent of the United States, No. 412,663, issued to me October 8, 1889, for an improvement in the method of and apparatus for straightening carriage corner-irons; and it consists in forming the edge of the strikingdie with an interrupted line or surface, in order that it may only contact with the plane of the corner-iron at certain parts or points thereon, preferably adjacent to the holes therein, instead of contacting with said iron throughout its entire length.

Referring again to the drawings, A represents'a drop, (upside down, as already stated,) which is mounted to be raised and released, so as to drop in a suitable drop-press, as shown in said patent. To said drop is secured the fixture b, in which are secured the die-like strikers c, as is shown in said patent. The lower or striking edge of dies 0 have at regular intervals depressions e, leaving the raised port-ions d, which alone come in contact with the corner-irons f, leaving the depressions h therein, the corner-iron when so struck by the die being rigidly clamped between the clamping fixtures B C, as explained in said patent. As the screwholes g in the corner-irons are at fixed but short distances from one another, it is preferable to so position the raised portions d on dies 0 that the depressions It shall coincide with said holes g, as thereby less force of impact of the dies with the corner-irons is required than if the blow were exerted upon any other portions of the corner-irons, and, besides, a better result is obtained than when the corner-iron is struck by the dies at any other place upon its surface. As the depressions h, formed in the corner-irons, are of but very slight depth, therefore the depressions e in dies 0 need not be of a depth to materially weaken the dies.

I am aware that it is not new to form forging-dies with depressions into which the heated metal may be forced in the act of forging the same into form, United States Patent No. 176,108 showing a die having a group of such depressions arranged in a geometrical figure, and hence I do not broadly claim a die having an interrupted or broken surface, said reference being adapted for use in forging heated iron, whichv would thereby be forced into the depressions, producing small isolated points upon-the forging; while my invention relates to a die adapted to act upon cold metal, and it has an elongated narrow surface of a widthmaterially less than that of the corner-irons on which they act and having the line of their face regularly interrupted, so that the portions remaining may act with greater energy and effect upon the hard surface of the corner-irons.

I claim as my invention- 1. A die for straightening carriage cornerirons.-having its face narrower than the width of said irons and of an outline corresponding thereto and interrupted in the line of its length, in manner substantially as specified.

2. The herein-described method of straightening carriage corner-irons, the same consisting in producing short and narrow indentations therein adjacent to the screw-holes by striking the iron while held in a clamping device with a die having a narrow. interrupted surface adapted to act upon the iron at said specified points only, substantially as specified.

EDWARD C. PORTER.

Witnesses:

T. W. POETER,/ EUGENE HUMPHREY. 

